atheros_2_0_function.patch

2 files changed, 920 insertions, 0 deletions

diff --git a/drivers/sdio/function/wlan/ar6000/hif/hif.c b/drivers/sdio/function/wlan/ar6000/hif/hif.c
new file mode 100644
index 00000000000..f5a098672a1
--- /dev/null
+++ b/drivers/sdio/function/wlan/ar6000/hif/hif.c
@@ -0,0 +1,818 @@
+/*
+ * @file: hif.c
+ *
+ * @abstract: HIF layer reference implementation for Atheros SDIO stack
+ *
+ * @notice: Copyright (c) 2004-2006 Atheros Communications Inc.
+ *
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 as
+ *  published by the Free Software Foundation;
+ *
+ *  Software distributed under the License is distributed on an "AS
+ *  IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
+ *  implied. See the License for the specific language governing
+ *  rights and limitations under the License.
+ *
+ *
+ *
+ */
+
+#include "hif_internal.h"
+
+/* ------ Static Variables ------ */
+
+/* ------ Global Variable Declarations ------- */
+SD_PNP_INFO Ids[] = {
+    {
+        .SDIO_ManufacturerID = MANUFACTURER_ID_AR6001_BASE | 0xB,
+        .SDIO_ManufacturerCode = MANUFACTURER_CODE,
+        .SDIO_FunctionClass = FUNCTION_CLASS,
+        .SDIO_FunctionNo = 1
+    },
+    {
+        .SDIO_ManufacturerID = MANUFACTURER_ID_AR6001_BASE | 0xA,
+        .SDIO_ManufacturerCode = MANUFACTURER_CODE,
+        .SDIO_FunctionClass = FUNCTION_CLASS,
+        .SDIO_FunctionNo = 1
+    },
+    {
+        .SDIO_ManufacturerID = MANUFACTURER_ID_AR6001_BASE | 0x9,
+        .SDIO_ManufacturerCode = MANUFACTURER_CODE,
+        .SDIO_FunctionClass = FUNCTION_CLASS,
+        .SDIO_FunctionNo = 1
+    },
+    {
+        .SDIO_ManufacturerID = MANUFACTURER_ID_AR6001_BASE | 0x8,
+        .SDIO_ManufacturerCode = MANUFACTURER_CODE,
+        .SDIO_FunctionClass = FUNCTION_CLASS,
+        .SDIO_FunctionNo = 1
+    },
+    {
+        .SDIO_ManufacturerID = MANUFACTURER_ID_AR6002_BASE | 0x0,
+        .SDIO_ManufacturerCode = MANUFACTURER_CODE,
+        .SDIO_FunctionClass = FUNCTION_CLASS,
+        .SDIO_FunctionNo = 1
+    },
+    {
+        .SDIO_ManufacturerID = MANUFACTURER_ID_AR6002_BASE | 0x1,
+        .SDIO_ManufacturerCode = MANUFACTURER_CODE,
+        .SDIO_FunctionClass = FUNCTION_CLASS,
+        .SDIO_FunctionNo = 1
+    },
+    {
+    }                      //list is null termintaed
+};
+
+TARGET_FUNCTION_CONTEXT FunctionContext = {
+    .function.Version    = CT_SDIO_STACK_VERSION_CODE,
+    .function.pName      = "sdio_wlan",
+    .function.MaxDevices = 1,
+    .function.NumDevices = 0,
+    .function.pIds       = Ids,
+    .function.pProbe     = hifDeviceInserted,
+    .function.pRemove    = hifDeviceRemoved,
+    .function.pSuspend   = NULL,
+    .function.pResume    = NULL,
+    .function.pWake      = NULL,
+    .function.pContext   = &FunctionContext,
+};
+
+HIF_DEVICE hifDevice[HIF_MAX_DEVICES];
+HTC_CALLBACKS htcCallbacks;
+BUS_REQUEST busRequest[BUS_REQUEST_MAX_NUM];
+static BUS_REQUEST *s_busRequestFreeQueue = NULL;
+OS_CRITICALSECTION lock;
+extern A_UINT32 onebitmode;
+extern A_UINT32 busspeedlow;
+extern A_UINT32 debughif;
+
+#ifdef DEBUG
+#define ATH_DEBUG_ERROR 1
+#define ATH_DEBUG_WARN  2
+#define ATH_DEBUG_TRACE 3
+#define _AR_DEBUG_PRINTX_ARG(arg...) arg
+#define AR_DEBUG_PRINTF(lvl, args)\
+    {if (lvl <= debughif)\
+        A_PRINTF(KERN_ALERT _AR_DEBUG_PRINTX_ARG args);\
+    }
+#else
+#define AR_DEBUG_PRINTF(lvl, args)
+#endif
+
+static BUS_REQUEST *hifAllocateBusRequest(void);
+static void hifFreeBusRequest(BUS_REQUEST *busrequest);
+static THREAD_RETURN insert_helper_func(POSKERNEL_HELPER pHelper);
+static void ResetAllCards(void);
+
+/* ------ Functions ------ */
+int HIFInit(HTC_CALLBACKS *callbacks)
+{
+    SDIO_STATUS status;
+    DBG_ASSERT(callbacks != NULL);
+
+    /* Store the callback and event handlers */
+    htcCallbacks.deviceInsertedHandler = callbacks->deviceInsertedHandler;
+    htcCallbacks.deviceRemovedHandler = callbacks->deviceRemovedHandler;
+    htcCallbacks.deviceSuspendHandler = callbacks->deviceSuspendHandler;
+    htcCallbacks.deviceResumeHandler = callbacks->deviceResumeHandler;
+    htcCallbacks.deviceWakeupHandler = callbacks->deviceWakeupHandler;
+    htcCallbacks.rwCompletionHandler = callbacks->rwCompletionHandler;
+    htcCallbacks.dsrHandler = callbacks->dsrHandler;
+
+    CriticalSectionInit(&lock);
+
+    /* Register with bus driver core */
+    status = SDIO_RegisterFunction(&FunctionContext.function);
+    DBG_ASSERT(SDIO_SUCCESS(status));
+
+    return(0);
+}
+
+A_STATUS
+HIFReadWrite(HIF_DEVICE *device,
+             A_UINT32 address,
+             A_UCHAR *buffer,
+             A_UINT32 length,
+             A_UINT32 request,
+             void *context)
+{
+    A_UINT8 rw;
+    A_UINT8 mode;
+    A_UINT8 funcNo;
+    A_UINT8 opcode;
+    A_UINT16 count;
+    SDREQUEST *sdrequest;
+    SDIO_STATUS sdiostatus;
+    BUS_REQUEST *busrequest;
+    A_STATUS    status = A_OK;
+
+    DBG_ASSERT(device != NULL);
+    DBG_ASSERT(device->handle != NULL);
+
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("Device: %p\n", device));
+
+    do {
+        busrequest = hifAllocateBusRequest();
+        if (busrequest == NULL) {
+            AR_DEBUG_PRINTF(ATH_DEBUG_ERROR, ("HIF Unable to allocate bus request\n"));
+            status = A_NO_RESOURCE;
+            break;
+        }
+
+        sdrequest = busrequest->request;
+        busrequest->context = context;
+
+        sdrequest->pDataBuffer = buffer;
+        if (request & HIF_SYNCHRONOUS) {
+            sdrequest->Flags = SDREQ_FLAGS_RESP_SDIO_R5 | SDREQ_FLAGS_DATA_TRANS;
+            sdrequest->pCompleteContext = NULL;
+            sdrequest->pCompletion = NULL;
+            AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("Execution mode: Synchronous\n"));
+        } else if (request & HIF_ASYNCHRONOUS) {
+            sdrequest->Flags = SDREQ_FLAGS_RESP_SDIO_R5 | SDREQ_FLAGS_DATA_TRANS |
+                               SDREQ_FLAGS_TRANS_ASYNC;
+            sdrequest->pCompleteContext = busrequest;
+            sdrequest->pCompletion = hifRWCompletionHandler;
+            AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("Execution mode: Asynchronous\n"));
+        } else {
+            AR_DEBUG_PRINTF(ATH_DEBUG_ERROR,
+                            ("Invalid execution mode: 0x%08x\n", request));
+            status = A_EINVAL;
+            break;
+        }
+
+        if (request & HIF_EXTENDED_IO) {
+            AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("Command type: CMD53\n"));
+            sdrequest->Command = CMD53;
+        } else {
+            AR_DEBUG_PRINTF(ATH_DEBUG_ERROR,
+                            ("Invalid command type: 0x%08x\n", request));
+            status = A_EINVAL;
+            break;
+        }
+
+        if (request & HIF_BLOCK_BASIS) {
+            mode = CMD53_BLOCK_BASIS;
+            sdrequest->BlockLen = HIF_MBOX_BLOCK_SIZE;
+            sdrequest->BlockCount = length / HIF_MBOX_BLOCK_SIZE;
+            count = sdrequest->BlockCount;
+            AR_DEBUG_PRINTF(ATH_DEBUG_TRACE,
+                            ("Block mode (BlockLen: %d, BlockCount: %d)\n",
+                            sdrequest->BlockLen, sdrequest->BlockCount));
+        } else if (request & HIF_BYTE_BASIS) {
+            mode = CMD53_BYTE_BASIS;
+            sdrequest->BlockLen = length;
+            sdrequest->BlockCount = 1;
+            count = sdrequest->BlockLen;
+            AR_DEBUG_PRINTF(ATH_DEBUG_TRACE,
+                            ("Byte mode (BlockLen: %d, BlockCount: %d)\n",
+                            sdrequest->BlockLen, sdrequest->BlockCount));
+        } else {
+            AR_DEBUG_PRINTF(ATH_DEBUG_ERROR,
+                            ("Invalid data mode: 0x%08x\n", request));
+            status = A_EINVAL;
+            break;
+        }
+
+#if 0
+        /* useful for checking register accesses */
+        if (length & 0x3) {
+            A_PRINTF(KERN_ALERT"HIF (%s) is not a multiple of 4 bytes, addr:0x%X, len:%d\n",
+                                request & HIF_WRITE ? "write":"read", address, length);
+        }
+#endif
+
+        if ((address >= HIF_MBOX_START_ADDR(0)) &&
+            (address <= HIF_MBOX_END_ADDR(3)))
+        {
+
+            DBG_ASSERT(length <= HIF_MBOX_WIDTH);
+
+            /*
+             * Mailbox write. Adjust the address so that the last byte
+             * falls on the EOM address.
+             */
+            address += (HIF_MBOX_WIDTH - length);
+        }
+
+
+
+        if (request & HIF_WRITE) {
+            rw = CMD53_WRITE;
+            sdrequest->Flags |= SDREQ_FLAGS_DATA_WRITE;
+            AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("Direction: Write\n"));
+        } else if (request & HIF_READ) {
+            rw = CMD53_READ;
+            AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("Direction: Read\n"));
+        } else {
+            AR_DEBUG_PRINTF(ATH_DEBUG_ERROR,
+                            ("Invalid direction: 0x%08x\n", request));
+            status = A_EINVAL;
+            break;
+        }
+
+        if (request & HIF_FIXED_ADDRESS) {
+            opcode = CMD53_FIXED_ADDRESS;
+            AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("Address mode: Fixed\n"));
+        } else if (request & HIF_INCREMENTAL_ADDRESS) {
+            opcode = CMD53_INCR_ADDRESS;
+            AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("Address mode: Incremental\n"));
+        } else {
+            AR_DEBUG_PRINTF(ATH_DEBUG_ERROR,
+                            ("Invalid address mode: 0x%08x\n", request));
+            status = A_EINVAL;
+            break;
+        }
+
+        funcNo = SDDEVICE_GET_SDIO_FUNCNO(device->handle);
+        AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("Function number: %d\n", funcNo));
+        SDIO_SET_CMD53_ARG(sdrequest->Argument, rw, funcNo,
+                           mode, opcode, address, count);
+
+        /* Send the command out */
+        sdiostatus = SDDEVICE_CALL_REQUEST_FUNC(device->handle, sdrequest);
+
+        if (!SDIO_SUCCESS(sdiostatus)) {
+            status = A_ERROR;
+        }
+
+    } while (FALSE);
+
+    if (A_FAILED(status) || (request & HIF_SYNCHRONOUS)) {
+        if (busrequest != NULL) {
+            hifFreeBusRequest(busrequest);
+        }
+    }
+
+    if (A_FAILED(status) && (request & HIF_ASYNCHRONOUS)) {
+            /* call back async handler on failure */
+        htcCallbacks.rwCompletionHandler(context, status);
+    }
+
+    return status;
+}
+
+A_STATUS
+HIFConfigureDevice(HIF_DEVICE *device, HIF_DEVICE_CONFIG_OPCODE opcode,
+                   void *config, A_UINT32 configLen)
+{
+    A_UINT32 count;
+
+    switch(opcode) {
+        case HIF_DEVICE_GET_MBOX_BLOCK_SIZE:
+            ((A_UINT32 *)config)[0] = HIF_MBOX0_BLOCK_SIZE;
+            ((A_UINT32 *)config)[1] = HIF_MBOX1_BLOCK_SIZE;
+            ((A_UINT32 *)config)[2] = HIF_MBOX2_BLOCK_SIZE;
+            ((A_UINT32 *)config)[3] = HIF_MBOX3_BLOCK_SIZE;
+            break;
+
+        case HIF_DEVICE_GET_MBOX_ADDR:
+            for (count = 0; count < 4; count ++) {
+                ((A_UINT32 *)config)[count] = HIF_MBOX_START_ADDR(count);
+            }
+            break;
+        case HIF_DEVICE_GET_IRQ_PROC_MODE:
+                /* the SDIO stack allows the interrupts to be processed either way, ASYNC or SYNC */
+            *((HIF_DEVICE_IRQ_PROCESSING_MODE *)config) = HIF_DEVICE_IRQ_ASYNC_SYNC;
+            break;
+        default:
+            AR_DEBUG_PRINTF(ATH_DEBUG_WARN,
+                            ("Unsupported configuration opcode: %d\n", opcode));
+            return A_ERROR;
+    }
+
+    return A_OK;
+}
+
+void
+HIFShutDownDevice(HIF_DEVICE *device)
+{
+    A_UINT8 data;
+    A_UINT32 count;
+    SDIO_STATUS status;
+    SDCONFIG_BUS_MODE_DATA busSettings;
+    SDCONFIG_FUNC_ENABLE_DISABLE_DATA fData;
+
+    if (device != NULL) {
+        DBG_ASSERT(device->handle != NULL);
+
+        /* Remove the allocated current if any */
+        status = SDLIB_IssueConfig(device->handle,
+                                   SDCONFIG_FUNC_FREE_SLOT_CURRENT, NULL, 0);
+        DBG_ASSERT(SDIO_SUCCESS(status));
+
+        /* Disable the card */
+        fData.EnableFlags = SDCONFIG_DISABLE_FUNC;
+        fData.TimeOut = 1;
+        status = SDLIB_IssueConfig(device->handle, SDCONFIG_FUNC_ENABLE_DISABLE,
+                                   &fData, sizeof(fData));
+        DBG_ASSERT(SDIO_SUCCESS(status));
+
+        /* Perform a soft I/O reset */
+        data = SDIO_IO_RESET;
+        status = SDLIB_IssueCMD52(device->handle, 0, SDIO_IO_ABORT_REG,
+                                  &data, 1, 1);
+        DBG_ASSERT(SDIO_SUCCESS(status));
+
+        /*
+         * WAR - Codetelligence driver does not seem to shutdown correctly in 1
+         * bit mode. By default it configures the HC in the 4 bit. Its later in
+         * our driver that we switch to 1 bit mode. If we try to shutdown, the
+         * driver hangs so we revert to 4 bit mode, to be transparent to the
+         * underlying bus driver.
+         */
+        if (onebitmode) {
+            ZERO_OBJECT(busSettings);
+            busSettings.BusModeFlags = SDDEVICE_GET_BUSMODE_FLAGS(device->handle);
+            SDCONFIG_SET_BUS_WIDTH(busSettings.BusModeFlags,
+                                   SDCONFIG_BUS_WIDTH_4_BIT);
+
+            /* Issue config request to change the bus width to 4 bit */
+            status = SDLIB_IssueConfig(device->handle, SDCONFIG_BUS_MODE_CTRL,
+                                       &busSettings,
+                                       sizeof(SDCONFIG_BUS_MODE_DATA));
+            DBG_ASSERT(SDIO_SUCCESS(status));
+        }
+
+        /* Free the bus requests */
+        for (count = 0; count < BUS_REQUEST_MAX_NUM; count ++) {
+            SDDeviceFreeRequest(device->handle, busRequest[count].request);
+        }
+        /* Clean up the queue */
+        s_busRequestFreeQueue = NULL;
+    } else {
+            /* since we are unloading the driver anyways, reset all cards in case the SDIO card
+             * is externally powered and we are unloading the SDIO stack.  This avoids the problem when
+             * the SDIO stack is reloaded and attempts are made to re-enumerate a card that is already
+             * enumerated */
+        ResetAllCards();
+        /* Unregister with bus driver core */
+        AR_DEBUG_PRINTF(ATH_DEBUG_TRACE,
+                        ("Unregistering with the bus driver\n"));
+        status = SDIO_UnregisterFunction(&FunctionContext.function);
+        DBG_ASSERT(SDIO_SUCCESS(status));
+    }
+}
+
+void
+hifRWCompletionHandler(SDREQUEST *request)
+{
+    A_STATUS status;
+    void *context;
+    BUS_REQUEST *busrequest;
+
+    if (SDIO_SUCCESS(request->Status)) {
+        status = A_OK;
+    } else {
+        status = A_ERROR;
+    }
+
+    DBG_ASSERT(status == A_OK);
+    busrequest = (BUS_REQUEST *) request->pCompleteContext;
+    context = (void *) busrequest->context;
+        /* free the request before calling the callback, in case the
+         * callback submits another request, this guarantees that
+         * there is at least 1 free request available everytime the callback
+         * is invoked */
+    hifFreeBusRequest(busrequest);
+    htcCallbacks.rwCompletionHandler(context, status);
+}
+
+void
+hifIRQHandler(void *context)
+{
+    A_STATUS status;
+    HIF_DEVICE *device;
+
+    device = (HIF_DEVICE *)context;
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("Device: %p\n", device));
+    status = htcCallbacks.dsrHandler(device->htc_handle);
+    DBG_ASSERT(status == A_OK);
+}
+
+BOOL
+hifDeviceInserted(SDFUNCTION *function, SDDEVICE *handle)
+{
+    BOOL enabled;
+    A_UINT8 data;
+    A_UINT32 count;
+    HIF_DEVICE *device;
+    SDIO_STATUS status;
+    A_UINT16 maxBlocks;
+    A_UINT16 maxBlockSize;
+    SDCONFIG_BUS_MODE_DATA busSettings;
+    SDCONFIG_FUNC_ENABLE_DISABLE_DATA fData;
+    TARGET_FUNCTION_CONTEXT *functionContext;
+    SDCONFIG_FUNC_SLOT_CURRENT_DATA slotCurrent;
+    SD_BUSCLOCK_RATE                currentBusClock;
+
+    DBG_ASSERT(function != NULL);
+    DBG_ASSERT(handle != NULL);
+
+    device = addHifDevice(handle);
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("Device: %p\n", device));
+    functionContext =  (TARGET_FUNCTION_CONTEXT *)function->pContext;
+
+    /*
+     * Issue commands to get the manufacturer ID and stuff and compare it
+     * against the rev Id derived from the ID registered during the
+     * initialization process. Report the device only in the case there
+     * is a match. In the case od SDIO, the bus driver has already queried
+     * these details so we just need to use their data structures to get the
+     * relevant values. Infact, the driver has already matched it against
+     * the Ids that we registered with it so we dont need to the step here.
+     */
+
+    /* Configure the SDIO Bus Width */
+    if (onebitmode) {
+        data = SDIO_BUS_WIDTH_1_BIT;
+        status = SDLIB_IssueCMD52(handle, 0, SDIO_BUS_IF_REG, &data, 1, 1);
+        if (!SDIO_SUCCESS(status)) {
+            AR_DEBUG_PRINTF(ATH_DEBUG_ERROR,
+                            ("Unable to set the bus width to 1 bit\n"));
+            return FALSE;
+        }
+    }
+
+    /* Get current bus flags */
+    ZERO_OBJECT(busSettings);
+
+    busSettings.BusModeFlags = SDDEVICE_GET_BUSMODE_FLAGS(handle);
+    if (onebitmode) {
+        SDCONFIG_SET_BUS_WIDTH(busSettings.BusModeFlags,
+                               SDCONFIG_BUS_WIDTH_1_BIT);
+    }
+
+        /* get the current operating clock, the bus driver sets us up based
+         * on what our CIS reports and what the host controller can handle
+         * we can use this to determine whether we want to drop our clock rate
+         * down */
+    currentBusClock = SDDEVICE_GET_OPER_CLOCK(handle);
+    busSettings.ClockRate = currentBusClock;
+
+    AR_DEBUG_PRINTF(ATH_DEBUG_TRACE,
+                        ("HIF currently running at: %d \n",currentBusClock));
+
+        /* see if HIF wants to run at a lower clock speed, we may already be
+         * at that lower clock speed */
+    if (currentBusClock > (SDIO_CLOCK_FREQUENCY_DEFAULT >> busspeedlow)) {
+        busSettings.ClockRate = SDIO_CLOCK_FREQUENCY_DEFAULT >> busspeedlow;
+        AR_DEBUG_PRINTF(ATH_DEBUG_WARN,
+                        ("HIF overriding clock to %d \n",busSettings.ClockRate));
+    }
+
+    /* Issue config request to override clock rate */
+    status = SDLIB_IssueConfig(handle, SDCONFIG_FUNC_CHANGE_BUS_MODE, &busSettings,
+                               sizeof(SDCONFIG_BUS_MODE_DATA));
+    if (!SDIO_SUCCESS(status)) {
+        AR_DEBUG_PRINTF(ATH_DEBUG_ERROR,
+                        ("Unable to configure the host clock\n"));
+        return FALSE;
+    } else {
+        AR_DEBUG_PRINTF(ATH_DEBUG_TRACE,
+                        ("Configured clock: %d, Maximum clock: %d\n",
+                        busSettings.ActualClockRate,
+                        SDDEVICE_GET_MAX_CLOCK(handle)));
+    }
+
+    /*
+     * Check if the target supports block mode. This result of this check
+     * can be used to implement the HIFReadWrite API.
+     */
+    if (SDDEVICE_GET_SDIO_FUNC_MAXBLKSIZE(handle)) {
+        /* Limit block size to operational block limit or card function
+           capability */
+        maxBlockSize = min(SDDEVICE_GET_OPER_BLOCK_LEN(handle),
+                           SDDEVICE_GET_SDIO_FUNC_MAXBLKSIZE(handle));
+
+        /* check if the card support multi-block transfers */
+        if (!(SDDEVICE_GET_SDIOCARD_CAPS(handle) & SDIO_CAPS_MULTI_BLOCK)) {
+            AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("Byte basis only\n"));
+
+            /* Limit block size to max byte basis */
+            maxBlockSize =  min(maxBlockSize,
+                                (A_UINT16)SDIO_MAX_LENGTH_BYTE_BASIS);
+            maxBlocks = 1;
+        } else {
+            AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("Multi-block capable\n"));
+            maxBlocks = SDDEVICE_GET_OPER_BLOCKS(handle);
+            status = SDLIB_SetFunctionBlockSize(handle, HIF_MBOX_BLOCK_SIZE);
+            if (!SDIO_SUCCESS(status)) {
+                AR_DEBUG_PRINTF(ATH_DEBUG_ERROR,
+                                ("Failed to set block size. Err:%d\n", status));
+                return FALSE;
+            }
+        }
+
+        AR_DEBUG_PRINTF(ATH_DEBUG_TRACE,
+                        ("Bytes Per Block: %d bytes, Block Count:%d \n",
+                        maxBlockSize, maxBlocks));
+    } else {
+        AR_DEBUG_PRINTF(ATH_DEBUG_ERROR,
+                        ("Function does not support Block Mode!\n"));
+        return FALSE;
+    }
+
+    /* Allocate the slot current */
+    status = SDLIB_GetDefaultOpCurrent(handle, &slotCurrent.SlotCurrent);
+    if (SDIO_SUCCESS(status)) {
+        AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("Allocating Slot current: %d mA\n",
+                                slotCurrent.SlotCurrent));
+        status = SDLIB_IssueConfig(handle, SDCONFIG_FUNC_ALLOC_SLOT_CURRENT,
+                                   &slotCurrent, sizeof(slotCurrent));
+        if (!SDIO_SUCCESS(status)) {
+            AR_DEBUG_PRINTF(ATH_DEBUG_ERROR,
+                            ("Failed to allocate slot current %d\n", status));
+            return FALSE;
+        }
+    }
+
+    /* Enable the dragon function */
+    count = 0;
+    enabled = FALSE;
+    fData.TimeOut = 1;
+    fData.EnableFlags = SDCONFIG_ENABLE_FUNC;
+    while ((count++ < SDWLAN_ENABLE_DISABLE_TIMEOUT) && !enabled)
+    {
+        /* Enable dragon */
+        status = SDLIB_IssueConfig(handle, SDCONFIG_FUNC_ENABLE_DISABLE,
+                                   &fData, sizeof(fData));
+        if (!SDIO_SUCCESS(status)) {
+            AR_DEBUG_PRINTF(ATH_DEBUG_TRACE,
+                            ("Attempting to enable the card again\n"));
+            continue;
+        }
+
+        /* Mark the status as enabled */
+        enabled = TRUE;
+    }
+
+    /* Check if we were succesful in enabling the target */
+    if (!enabled) {
+        AR_DEBUG_PRINTF(ATH_DEBUG_ERROR,
+                        ("Failed to communicate with the target\n"));
+        return FALSE;
+    }
+
+    /* Allocate the bus requests to be used later */
+    A_MEMZERO(busRequest, sizeof(busRequest));
+    for (count = 0; count < BUS_REQUEST_MAX_NUM; count ++) {
+        if ((busRequest[count].request = SDDeviceAllocRequest(handle)) == NULL){
+            AR_DEBUG_PRINTF(ATH_DEBUG_ERROR, ("Unable to allocate memory\n"));
+            /* TODO: Free the memory that has already been allocated */
+            return FALSE;
+        }
+        hifFreeBusRequest(&busRequest[count]);
+
+        AR_DEBUG_PRINTF(ATH_DEBUG_TRACE,
+                ("0x%08x = busRequest[%d].request = 0x%08x\n",
+				(unsigned int) &busRequest[count], count,
+				(unsigned int) busRequest[count].request));
+    }
+
+        /* Schedule a worker to handle device inserted, this is a temporary workaround
+         * to fix a deadlock if the device fails to intialize in the insertion handler
+         * The failure causes the instance to shutdown the HIF layer and unregister the
+         * function driver within the busdriver probe context which can deadlock
+         *
+         * NOTE: we cannot use the default work queue because that would block
+         * SD bus request processing for all synchronous I/O. We must use a kernel
+         * thread that is creating using the helper library.
+         * */
+
+    if (SDIO_SUCCESS(SDLIB_OSCreateHelper(&device->insert_helper,
+                         insert_helper_func,
+                         device))) {
+        device->helper_started = TRUE;
+    }
+
+    return TRUE;
+}
+
+static THREAD_RETURN insert_helper_func(POSKERNEL_HELPER pHelper)
+{
+
+    /*
+     * Adding a wait of around a second before we issue the very first
+     * command to dragon. During the process of loading/unloading the
+     * driver repeatedly it was observed that we get a data timeout
+     * while accessing function 1 registers in the chip. The theory at
+     * this point is that some initialization delay in dragon is
+     * causing the SDIO state in dragon core to be not ready even after
+     * the ready bit indicates that function 1 is ready. Accomodating
+     * for this behavior by adding some delay in the driver before it
+     * issues the first command after switching on dragon. Need to
+     * investigate this a bit more - TODO
+     */
+
+    A_MDELAY(1000);
+        /* Inform HTC */
+    if ((htcCallbacks.deviceInsertedHandler(SD_GET_OS_HELPER_CONTEXT(pHelper))) != A_OK) {
+        AR_DEBUG_PRINTF(ATH_DEBUG_TRACE, ("Device rejected\n"));
+    }
+
+    return 0;
+}
+
+void
+HIFAckInterrupt(HIF_DEVICE *device)
+{
+    SDIO_STATUS status;
+    DBG_ASSERT(device != NULL);
+    DBG_ASSERT(device->handle != NULL);
+
+    /* Acknowledge our function IRQ */
+    status = SDLIB_IssueConfig(device->handle, SDCONFIG_FUNC_ACK_IRQ,
+                               NULL, 0);
+    DBG_ASSERT(SDIO_SUCCESS(status));
+}
+
+void
+HIFUnMaskInterrupt(HIF_DEVICE *device)
+{
+    SDIO_STATUS status;
+
+    DBG_ASSERT(device != NULL);
+    DBG_ASSERT(device->handle != NULL);
+
+    /* Register the IRQ Handler */
+    SDDEVICE_SET_IRQ_HANDLER(device->handle, hifIRQHandler, device);
+
+    /* Unmask our function IRQ */
+    status = SDLIB_IssueConfig(device->handle, SDCONFIG_FUNC_UNMASK_IRQ,
+                               NULL, 0);
+    DBG_ASSERT(SDIO_SUCCESS(status));
+}
+
+void HIFMaskInterrupt(HIF_DEVICE *device)
+{
+    SDIO_STATUS status;
+    DBG_ASSERT(device != NULL);
+    DBG_ASSERT(device->handle != NULL);
+
+    /* Mask our function IRQ */
+    status = SDLIB_IssueConfig(device->handle, SDCONFIG_FUNC_MASK_IRQ,
+                               NULL, 0);
+    DBG_ASSERT(SDIO_SUCCESS(status));
+
+    /* Unregister the IRQ Handler */
+    SDDEVICE_SET_IRQ_HANDLER(device->handle, NULL, NULL);
+}
+
+static BUS_REQUEST *hifAllocateBusRequest(void)
+{
+    BUS_REQUEST *busrequest;
+
+    /* Acquire lock */
+    CriticalSectionAcquire(&lock);
+
+    /* Remove first in list */
+    if((busrequest = s_busRequestFreeQueue) != NULL)
+    {
+        s_busRequestFreeQueue = busrequest->next;
+    }
+
+    /* Release lock */
+    CriticalSectionRelease(&lock);
+
+    return busrequest;
+}
+
+static void
+hifFreeBusRequest(BUS_REQUEST *busrequest)
+{
+    DBG_ASSERT(busrequest != NULL);
+
+    /* Acquire lock */
+    CriticalSectionAcquire(&lock);
+
+    /* Insert first in list */
+    busrequest->next = s_busRequestFreeQueue;
+    s_busRequestFreeQueue = busrequest;
+
+    /* Release lock */
+    CriticalSectionRelease(&lock);
+}
+
+void
+hifDeviceRemoved(SDFUNCTION *function, SDDEVICE *handle)
+{
+    A_STATUS status;
+    HIF_DEVICE *device;
+    DBG_ASSERT(function != NULL);
+    DBG_ASSERT(handle != NULL);
+
+    device = getHifDevice(handle);
+    status = htcCallbacks.deviceRemovedHandler(device->htc_handle, A_OK);
+
+        /* cleanup the helper thread */
+    if (device->helper_started) {
+        SDLIB_OSDeleteHelper(&device->insert_helper);
+        device->helper_started = FALSE;
+    }
+
+    delHifDevice(handle);
+    DBG_ASSERT(status == A_OK);
+}
+
+HIF_DEVICE *
+addHifDevice(SDDEVICE *handle)
+{
+    DBG_ASSERT(handle != NULL);
+    hifDevice[0].handle = handle;
+    return &hifDevice[0];
+}
+
+HIF_DEVICE *
+getHifDevice(SDDEVICE *handle)
+{
+    DBG_ASSERT(handle != NULL);
+    return &hifDevice[0];
+}
+
+void
+delHifDevice(SDDEVICE *handle)
+{
+    DBG_ASSERT(handle != NULL);
+    hifDevice[0].handle = NULL;
+}
+
+static void ResetAllCards(void)
+{
+    UINT8       data;
+    SDIO_STATUS status;
+    int         i;
+
+    data = SDIO_IO_RESET;
+
+    /* set the I/O CARD reset bit:
+     * NOTE: we are exploiting a "feature" of the SDIO core that resets the core when you
+     * set the RES bit in the SDIO_IO_ABORT register.  This bit however "normally" resets the
+     * I/O functions leaving the SDIO core in the same state (as per SDIO spec).
+     * In this design, this reset can be used to reset the SDIO core itself */
+    for (i = 0; i < HIF_MAX_DEVICES; i++) {
+        if (hifDevice[i].handle != NULL) {
+            AR_DEBUG_PRINTF(ATH_DEBUG_TRACE,
+                        ("Issuing I/O Card reset for instance: %d \n",i));
+                /* set the I/O Card reset bit */
+            status = SDLIB_IssueCMD52(hifDevice[i].handle,
+                                      0,                    /* function 0 space */
+                                      SDIO_IO_ABORT_REG,
+                                      &data,
+                                      1,                    /* 1 byte */
+                                      TRUE);                /* write */
+        }
+    }
+
+}
+
+void HIFSetHandle(void *hif_handle, void *handle)
+{
+    HIF_DEVICE *device = (HIF_DEVICE *) hif_handle;
+
+    device->htc_handle = handle;
+
+    return;
+}
diff --git a/drivers/sdio/function/wlan/ar6000/hif/hif_internal.h b/drivers/sdio/function/wlan/ar6000/hif/hif_internal.h
new file mode 100644
index 00000000000..d8fc1013234
--- /dev/null
+++ b/drivers/sdio/function/wlan/ar6000/hif/hif_internal.h
@@ -0,0 +1,102 @@
+/*
+ * @file: hif_internal.h
+ *
+ * @abstract: internal header file for hif layer
+ *
+ * @notice: Copyright (c) 2004-2006 Atheros Communications Inc.
+ *
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 as
+ *  published by the Free Software Foundation;
+ *
+ *  Software distributed under the License is distributed on an "AS
+ *  IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
+ *  implied. See the License for the specific language governing
+ *  rights and limitations under the License.
+ *
+ *
+ *
+ */
+
+#include <linux/sdio/ctsystem.h>
+#include <linux/sdio/sdio_busdriver.h>
+#include <linux/sdio/_sdio_defs.h>
+#include <linux/sdio/sdio_lib.h>
+#include "a_config.h"
+#include "athdefs.h"
+#include "a_types.h"
+#include "a_osapi.h"
+#include "hif.h"
+
+#define MANUFACTURER_ID_AR6001_BASE        0x100
+#define MANUFACTURER_ID_AR6002_BASE        0x200
+#define FUNCTION_CLASS                     0x0
+#define MANUFACTURER_CODE                  0x271
+
+#define BUS_REQUEST_MAX_NUM                64
+
+#define SDIO_CLOCK_FREQUENCY_DEFAULT       25000000
+#define SDWLAN_ENABLE_DISABLE_TIMEOUT      20
+#define FLAGS_CARD_ENAB                    0x02
+#define FLAGS_CARD_IRQ_UNMSK               0x04
+
+#define HIF_MBOX_BLOCK_SIZE                128
+#define HIF_MBOX_BASE_ADDR                 0x800
+#define HIF_MBOX_WIDTH                     0x800
+#define HIF_MBOX0_BLOCK_SIZE               1
+#define HIF_MBOX1_BLOCK_SIZE               HIF_MBOX_BLOCK_SIZE
+#define HIF_MBOX2_BLOCK_SIZE               HIF_MBOX_BLOCK_SIZE
+#define HIF_MBOX3_BLOCK_SIZE               HIF_MBOX_BLOCK_SIZE
+
+#define HIF_MBOX_START_ADDR(mbox)                        \
+    HIF_MBOX_BASE_ADDR + mbox * HIF_MBOX_WIDTH
+
+#define HIF_MBOX_END_ADDR(mbox)	                         \
+    HIF_MBOX_START_ADDR(mbox) + HIF_MBOX_WIDTH - 1
+
+struct hif_device {
+    SDDEVICE *handle;
+    void *htc_handle;
+    OSKERNEL_HELPER insert_helper;
+    BOOL  helper_started;
+};
+
+typedef struct target_function_context {
+    SDFUNCTION           function; /* function description of the bus driver */
+    OS_SEMAPHORE         instanceSem; /* instance lock. Unused */
+    SDLIST               instanceList; /* list of instances. Unused */
+} TARGET_FUNCTION_CONTEXT;
+
+typedef struct bus_request {
+    struct bus_request *next;
+    SDREQUEST *request;
+    void *context;
+} BUS_REQUEST;
+
+BOOL
+hifDeviceInserted(SDFUNCTION *function, SDDEVICE *device);
+
+void
+hifDeviceRemoved(SDFUNCTION *function, SDDEVICE *device);
+
+SDREQUEST *
+hifAllocateDeviceRequest(SDDEVICE *device);
+
+void
+hifFreeDeviceRequest(SDREQUEST *request);
+
+void
+hifRWCompletionHandler(SDREQUEST *request);
+
+void
+hifIRQHandler(void *context);
+
+HIF_DEVICE *
+addHifDevice(SDDEVICE *handle);
+
+HIF_DEVICE *
+getHifDevice(SDDEVICE *handle);
+
+void
+delHifDevice(SDDEVICE *handle);